a:3:{s:7:"widgets";a:3:{i:0;a:7:{s:5:"title";s:0:"";s:4:"text";s:690:"The development of LED lamps has gone through five stages:

One: In the 1960s, people learned the basics of semiconductor materials that can produce light, and the first commercial LED diodes were produced in 1960<a href="https://nsslighting.com/">.</a>

Two: The core part of the light-emitting diode is a wafer composed of p-type semiconductors and n-type semiconductors. There is a transition layer between p-type semiconductors and n-type semiconductors, called p-n junction.

Elements In and N were introduced in the mid-1970s, enabling LED lights to produce green, yellow, and orange light, and their luminous efficiency increased to 1 lumen/watt<a href="https://zpledbulb.com/">.</a>";s:6:"filter";b:1;s:6:"visual";b:1;s:22:"so_sidebar_emulator_id";s:14:"text-384310000";s:11:"option_name";s:11:"widget_text";s:11:"panels_info";a:7:{s:5:"class";s:14:"WP_Widget_Text";s:3:"raw";b:0;s:4:"grid";i:0;s:4:"cell";i:0;s:2:"id";i:0;s:9:"widget_id";s:36:"5a2347a6-31e8-4d5c-9c63-2963a8c29d85";s:5:"style";a:2:{s:27:"background_image_attachment";b:0;s:18:"background_display";s:4:"tile";}}}i:1;a:17:{s:5:"image";i:2838;s:14:"image_fallback";s:0:"";s:4:"size";s:4:"full";s:5:"align";s:7:"default";s:11:"title_align";s:7:"default";s:5:"title";s:0:"";s:14:"title_position";s:6:"hidden";s:3:"alt";s:0:"";s:3:"url";s:0:"";s:5:"bound";b:1;s:12:"_sow_form_id";s:32:"15676241636356265d78edc509139191";s:19:"_sow_form_timestamp";s:13:"1666590335199";s:10:"new_window";b:0;s:10:"full_width";b:0;s:22:"so_sidebar_emulator_id";s:19:"sow-image-384310001";s:11:"option_name";s:16:"widget_sow-image";s:11:"panels_info";a:7:{s:5:"class";s:30:"SiteOrigin_Widget_Image_Widget";s:3:"raw";b:0;s:4:"grid";i:0;s:4:"cell";i:0;s:2:"id";i:1;s:9:"widget_id";s:36:"362fc0f8-7d73-423f-a33c-d38673136836";s:5:"style";a:2:{s:27:"background_image_attachment";b:0;s:18:"background_display";s:4:"tile";}}}i:2;a:7:{s:5:"title";s:0:"";s:4:"text";s:1012:"Three: In 1989, white LED lamps were successfully developed.

The LED is packaged with a GaN chip and aluminum garnet (YAG).

The GaN chip emits blue light (λp=465nm, Wd=30nm). After the YAG with Ce3+ content made by high temperature sintering is stimulated by this blue light, the phosphor emits yellow light with a peak value of 550nm.

Four: In 1993, Japan Nakamura Shuji successfully developed a high-brightness blue light-emitting diode.

Compared with traditional fluorescent lamps and incandescent bulbs, LEDs are not only small in size, environmentally friendly, power-saving, and have a lifespan of up to 100,000 hours. Light-emitting diodes have jumped to become a new light source for lighting and displays in the 21st century.

5: On October 13, 2018, the team of academicians Huang Wei and Wang Jianpu of the Chinese Academy of Sciences increased the external quantum efficiency of perovskite light-emitting diodes (LEDs) to 20.7%, nearly half of that of international counterparts. " published on.";s:6:"filter";b:1;s:6:"visual";b:1;s:11:"panels_info";a:6:{s:5:"class";s:14:"WP_Widget_Text";s:4:"grid";i:0;s:4:"cell";i:0;s:2:"id";i:2;s:9:"widget_id";s:36:"6af85608-98cb-4ebc-b077-959d8a9e6760";s:5:"style";a:2:{s:27:"background_image_attachment";b:0;s:18:"background_display";s:4:"tile";}}s:22:"so_sidebar_emulator_id";s:14:"text-384310002";s:11:"option_name";s:11:"widget_text";}}s:5:"grids";a:1:{i:0;a:2:{s:5:"cells";i:1;s:5:"style";a:0:{}}}s:10:"grid_cells";a:1:{i:0;a:4:{s:4:"grid";i:0;s:5:"index";i:0;s:6:"weight";i:1;s:5:"style";a:0:{}}}}